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Assessing dynamic compression of AA2024-T351 with split Hopkinson pressure bar simulation 用拆分Hopkinson压杆模拟评估AA2024-T351的动态压缩
IF 1.1 Q3 Engineering Pub Date : 2023-01-11 DOI: 10.1680/jencm.22.00014
M. Gupta
The dynamic compressive behaviour of aluminium alloy AA2024-T351, which is commonly used for maritime and offshore structures, is important to understand. This is generally done using Taylor impact tests, projectile tests and split Hopkinson pressure bars. It can also be done less expensively using a finite-element simulation of a split Hopkinson pressure bar under different conditions. This paper numerically investigates the effects of striker velocity, striker shape and specimen shape on the dynamic compressive behaviour of AA2024-T351 using a simulated split Hopkinson pressure bar. The material behaviour was found to be sensitive to strain rates, striker shapes and specimen shapes under various situations.
AA2024-T351铝合金通常用于船舶和海上结构,了解其动态压缩性能非常重要。这通常是通过泰勒冲击试验、抛射试验和霍普金森压力杆来完成的。使用不同条件下的霍普金森压力杆的有限元模拟也可以更便宜地完成。采用模拟分离式霍普金森压杆,数值研究了冲击头速度、冲击头形状和试样形状对AA2024-T351动压特性的影响。在各种情况下,材料的行为对应变速率、冲击头形状和试样形状都很敏感。
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引用次数: 0
Investigating the hydraulic resonance behavior in pressurized in-series piping systems 串联加压管道系统液压谐振特性研究
IF 1.1 Q3 Engineering Pub Date : 2022-12-05 DOI: 10.1680/jencm.21.00006
Badreddine Essaidi, A. Triki
This study outlines a methodology to inspect the resonant characteristics of in-series-pipes hydraulic systems. The numerical model is based on the impedance approach, assuming the sinusoidal fluctuations of flow-rate and pressure parameters, in conjunction with the Transfert Matrix concept, being implemented for automatic calculations within a complex piping systems framework. To verify the validity of the used numerical technique, the computed results were compared with a conventional numerical solution quoted in the literature. Applications address the free and forced vibration cases occurring into an in-series-pipes system. The free vibration case, is caused by an oscillating valve downstream with a constant level tank upstream; while the forced vibration case is caused by the closure of a turbine downstream. The obtained results show the reliability of the proposed numerical procedure to determine the natural frequencies of a complex in-series hydraulic system. However, this study unveils that the “equivalent pipe” concept is not accurate for analyzing the resonating behavior of a complex in-series pipe system.
本研究概述了一种检测串联管道液压系统谐振特性的方法。数值模型基于阻抗方法,假设流量和压力参数的正弦波动,结合传输矩阵概念,在复杂的管道系统框架内实现自动计算。为了验证所采用数值方法的有效性,将计算结果与文献中引用的常规数值解进行了比较。应用程序解决了在串联管道系统中发生的自由和强制振动情况。自由振动的情况下,是由一个振荡阀下游与一个恒定的液位罐上游;而强迫振动情况是由于下游涡轮关闭造成的。计算结果表明,所提出的确定复杂串联液压系统固有频率的数值方法是可靠的。然而,该研究揭示了“等效管道”概念对于分析复杂串联管道系统的谐振行为并不准确。
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引用次数: 0
Finite Element Modelling of RC Beams with CFRP Strengthened Web Openings 碳纤维布加固腹板开孔RC梁的有限元模拟
IF 1.1 Q3 Engineering Pub Date : 2022-10-26 DOI: 10.1680/jencm.22.00010
Ahmed A. Elansary, Hadeer H. Abd El Salam, H. Abdalla
Web openings are commonly used in reinforced concrete (RC) beams to accommodate pipes, ducts, and utilities. The expected reduction in strength can be compensated by locally strengthening the beam opening with carbon-fiber-reinforced polymer (CFRP). In this paper, a robust nonlinear finite element model (FEM) is developed to simulate the behavior of RC beams with/without openings. The model can simulate the strengthening of the beam opening with CFRP sheets. The developed FEM is validated using seven simply supported RC beams that were previously tested under monotonic two concentrated loads. One specimen was considered as a control beam that did not have any openings, while the six other beams had a web opening with various dimensions and locations from support, two of them were strengthened with CFRP. The crack pattern and load-deflection relationship, from the FEM, were compared to those obtained from the experiments. The developed FEM was utilized to conduct a parametric study on 32 beams to investigate the behavior of RC beams with CFRP strengthened openings. The parametric study showed that the opening width did not significantly affect the load at failure. However, both the opening depth and distance from support had a clear effect on the failure load. Increasing the stirrups diameter from 8 mm to 10 mm increased the shear capacity of RC beams by 3∼16%. Also, it was concluded that strengthening the web opening with CFRP sheets increased the shear capacity by 1∼26% compared to similar beams without CFRP. The failure loads obtained from the proposed FEM were compared to those obtained from international design codes; the ACI 318-19 (2019), CSA A23.3-14 (2014), ACI 440.1R (2015) and CSA-S806 (2012). Differences between the FEM and predicted failure loads ranged between −30% to +50% for ACI 318-19 (2019) and −19% to +63% for CSA A23.3-14 (2014) for beams without CFRP. The differences became −18% to +54% for ACI 440.1R (2015) and +5% to +80% for CSA-S806 (2012) for beams with CFRP.
腹板开口通常用于钢筋混凝土(RC)梁,以容纳管道,管道和公用设施。预期的强度降低可以通过使用碳纤维增强聚合物(CFRP)局部加强梁开口来补偿。本文建立了具有鲁棒性的非线性有限元模型来模拟开孔/不开孔钢筋混凝土梁的受力特性。该模型可以模拟碳纤维布加固梁孔的过程。采用七个简支梁进行了有限元验证,这些简支梁在单调的两个集中荷载下进行了试验。其中1根梁为控制梁,不设开口,其余6根梁有腹板开口,尺寸和位置各异,其中2根梁用CFRP加固。将有限元计算得到的裂缝形态和荷载-挠度关系与试验结果进行了比较。采用所开发的有限元方法对32根梁进行了参数化分析,研究了CFRP加固开孔RC梁的受力性能。参数化研究表明,开口宽度对破坏时的荷载影响不显著。然而,开孔深度和离支架的距离对破坏荷载有明显的影响。将马镫直径从8毫米增加到10毫米,RC梁的抗剪能力提高了3 ~ 16%。此外,还得出结论,与不使用碳纤维布的类似梁相比,使用碳纤维布加强腹板开口可使剪力提高1 ~ 26%。将有限元法计算的破坏荷载与国际设计规范计算的破坏荷载进行了比较;ACI 318-19(2019)、CSA A23.3-14(2014)、ACI 440.1R(2015)和CSA- s806(2012)。对于无CFRP的梁,ACI 318-19(2019)的FEM和预测失效载荷之间的差异在- 30%到+50%之间,CSA A23.3-14(2014)的- 19%到+63%之间。对于CFRP梁,ACI 440.1R(2015)的差异为- 18%至+54%,CSA-S806(2012)的差异为+5%至+80%。
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引用次数: 0
Natural Ventilation in Caribbean homes: a Numerical Investigation 加勒比地区家庭的自然通风:一项数值调查
IF 1.1 Q3 Engineering Pub Date : 2022-10-12 DOI: 10.1680/jencm.21.00001
D. Villarroel-Lamb, A. R. Lamb
Traditionally, residential buildings in the Caribbean relied on natural ventilation to regulate air quality and temperature. As urban areas developed, there was greater dependence on mechanical ventilation and air-conditioning. In a bid to reduce the carbon footprint, there is an impetus to promote methods of natural ventilation. This research completes Computational Fluid Dynamics (CFD) analyses, using a typical contemporary model home as a case study, to investigate the natural ventilation performance of two types of ventilation blocks, Arcadian and Innovent, available for use in residences in Trinidad and Tobago. Differences in terms of internal air velocity due to varying wind directions are compared for each type of ventilation block used which are primarily positioned in the upper portions of the walls. The Arcadian has been used since the 1960s, with the Innovent being a more recent addition to the Caribbean construction landscape. The air velocities varied across the elevation, and the wind direction was a critical factor in achieving maximum air speeds at indoor locations. The elevation-averaged internal air flow velocities were similar for both ventilation blocks investigated, and the changes in wind direction showed no significant difference in the overall ventilation performance characteristics when comparing the two blocks.
传统上,加勒比地区的住宅建筑依靠自然通风来调节空气质量和温度。随着城市地区的发展,人们对机械通风和空调的依赖程度越来越高。为了减少碳足迹,有一种推动自然通风的方法。本研究完成了计算流体动力学(CFD)分析,以典型的当代样板房为例,研究了两种类型的通风街区,Arcadian和Innovent,可用于特立尼达和多巴哥的住宅。由于风向不同,内部空气速度的差异被用于比较主要位于墙壁上部的每种类型的通风块。阿卡迪亚自20世纪60年代以来一直在使用,而Innovent则是最近加入加勒比海建筑景观的。风速在不同的海拔高度变化,而风向是在室内达到最大风速的关键因素。两个通风街区的海拔平均内部气流速度相似,风向变化对两个街区的整体通风性能特征没有显著差异。
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引用次数: 0
Study on mesoscopic numerical parameters in numerical tests of sand-pebble geology 砂砾地质数值试验中细观数值参数研究
IF 1.1 Q3 Engineering Pub Date : 2022-08-23 DOI: 10.1680/jencm.22.00007
Xuansheng Cheng, Huadong Liu, Haibo Liu, Yuyue Bu, Hong-yan Su, Chaobo Chen
To study the influence of the meso-mechanical parameters of sand-pebble on the macro-mechanical properties, the numerical simulation method of discrete element method and the sand-pebble numerical triaxial test are used, a test method for elliptical particles is proposed, and the sensitivity analysis of the meso-mechanical parameters of sand-pebble is performed. The results show that the effective modulus of the particles has a significant effect on the macroscopic elastic modulus of the material, and the increase in the macroscopic elastic modulus of the material has an approximately linear relationship with the increase in the effective modulus. The effect of the particle stiffness ratio on the macro-mechanical properties of the material is insignificant. The increase in the friction coefficient is roughly linearly related to the increase in the peak stress. The increase in the interparticle porosity has a negative correlation with the decrease in the peak stress, and the particle diameter ratio affects both the number of particles produced and the peak stress. This paper provides a reference for the theoretical basis for subsequent research on the physical and mechanical characteristics of sand-pebble geology.
为研究砂砾细观力学参数对其宏观力学性能的影响,采用离散元法数值模拟方法和砂砾数值三轴试验,提出了一种椭圆颗粒的试验方法,并对砂砾细观力学参数进行了敏感性分析。结果表明:颗粒的有效模量对材料的宏观弹性模量有显著影响,材料宏观弹性模量的增加与有效模量的增加近似成线性关系。颗粒刚度比对材料宏观力学性能的影响不显著。摩擦系数的增加与峰值应力的增加大致成线性关系。颗粒间孔隙度的增大与峰值应力的减小呈负相关,颗粒直径比对颗粒数和峰值应力均有影响。本文为后续砂砾地质物理力学特征研究提供了理论基础参考。
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引用次数: 0
Discrete Element Modelling of Concrete Behaviour under Uniaxial Compressive Test 单轴压缩试验下混凝土性能的离散元建模
IF 1.1 Q3 Engineering Pub Date : 2022-05-27 DOI: 10.1680/jencm.21.00019
S. Marooden, H. Rahimi
This paper presents a three-dimensional (3D) simulation of the concrete behavior in a uniaxial compressive test using Discrete Element Modelling (DEM). The aim of this paper is to validate the numerical model developed and to study the cracking initiation and failure process in order to better understand the fracture behavior of concrete. The particles were distributed using an algorithm that is based on sieve test analysis. The parameters were set up in order to validate the numerical model with the experimental result. It was observed that the three-dimensional model with 44339 spheres is in line with the laboratory test in term of stress-strain response and macroscopic cracks development. Once the bond between the spheres was broken, it lead to the formation of microscopic cracks which were not visible in laboratory test. DEM can help to identify which part of a concrete structural element is more prone to the evolution of microscopic and macroscopic cracks. From the observation recorded during the testing, it is clear that DEM is capable of capturing concrete behavior both quantitatively and qualitatively. It is also possible to measure the strain energy stored in the linear contact bond and parallel bond. At the yielding point in the concrete the strain energy is released in the form of kinetic energy, frictional slip energy, energy of dashpot and local damping. This can be extended further to calculate fracture energy in the future works. Hence, it can be concluded DEM can be used to study the random nature of the cracking and fracturing of concrete structures.
本文采用离散元模型(DEM)对单轴压缩试验中的混凝土进行了三维(3D)模拟。本文的目的是验证所建立的数值模型,并研究混凝土的开裂起裂和破坏过程,以便更好地了解混凝土的断裂行为。采用基于筛分试验分析的算法对颗粒进行分布。为了验证数值模型与实验结果的一致性,对数值模型进行了参数设置。结果表明,含44339个球的三维模型在应力-应变响应和宏观裂纹发展方面与实验室试验基本一致。一旦球体之间的结合被打破,就会导致微观裂纹的形成,这在实验室测试中是不可见的。DEM可以帮助识别混凝土结构单元的哪一部分更容易发生微观和宏观裂缝的演变。从测试期间记录的观察结果来看,很明显DEM能够定量和定性地捕获具体行为。还可以测量存储在线性接触键和平行键中的应变能。在混凝土屈服点处,应变能以动能、摩擦滑移能、阻尼器能和局部阻尼的形式释放。这可以在以后的工作中进一步推广到裂缝能的计算中。因此,可以得出结论,DEM可以用于研究混凝土结构开裂和断裂的随机性。
{"title":"Discrete Element Modelling of Concrete Behaviour under Uniaxial Compressive Test","authors":"S. Marooden, H. Rahimi","doi":"10.1680/jencm.21.00019","DOIUrl":"https://doi.org/10.1680/jencm.21.00019","url":null,"abstract":"This paper presents a three-dimensional (3D) simulation of the concrete behavior in a uniaxial compressive test using Discrete Element Modelling (DEM). The aim of this paper is to validate the numerical model developed and to study the cracking initiation and failure process in order to better understand the fracture behavior of concrete. The particles were distributed using an algorithm that is based on sieve test analysis. The parameters were set up in order to validate the numerical model with the experimental result. It was observed that the three-dimensional model with 44339 spheres is in line with the laboratory test in term of stress-strain response and macroscopic cracks development. Once the bond between the spheres was broken, it lead to the formation of microscopic cracks which were not visible in laboratory test. DEM can help to identify which part of a concrete structural element is more prone to the evolution of microscopic and macroscopic cracks. From the observation recorded during the testing, it is clear that DEM is capable of capturing concrete behavior both quantitatively and qualitatively. It is also possible to measure the strain energy stored in the linear contact bond and parallel bond. At the yielding point in the concrete the strain energy is released in the form of kinetic energy, frictional slip energy, energy of dashpot and local damping. This can be extended further to calculate fracture energy in the future works. Hence, it can be concluded DEM can be used to study the random nature of the cracking and fracturing of concrete structures.","PeriodicalId":54061,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90528697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An overview of Large-Eddy Simulation for wind loading on slender structures 细长结构风荷载大涡模拟研究综述
IF 1.1 Q3 Engineering Pub Date : 2022-04-07 DOI: 10.1680/jencm.18.00028
S. Daniels, Zheng-Tong Xie
Understanding and predicting the effects of wind loading on a structure is necessary for a safe, effective, and economical engineering design. Wind tunnel techniques are expensive and often provide data that is not sufficiently detailed for the structural engineer. With increasing advances in computational capabilities, it has recently become feasible to investigate these flows using numerical techniques. Of these, one of the most effective approaches to simulate the turbulence observed in natural wind is Large-Eddy Simulation (LES). The application of LES to analyse wind loading, and aeroelastic effects on structures are only a recent venture in the field. This paper reviews the progress made over the last few decades for the analysis of wind flow around slender structures, and the more recent analysis incorporating the effects of freestream turbulence. Firstly, a review of the literature for generating freestream turbulence is carried out, and are assessed based on their flaws and strengths. A number of these are subsequently used for the analysis of surface pressures on an isolated tall model building. Subsequently, a review is made into wind tunnel analysis and LES for the aeroelastic analysis of bridge sections. The recent advances in the understanding of turbulence effects on the aeroestatic responses are summarised. The future of LES and its relationship wind tunnel analysis for wind loading analysis are discussed.
了解和预测风荷载对结构的影响对安全、有效和经济的工程设计是必要的。风洞技术是昂贵的,通常提供的数据不够详细的结构工程师。随着计算能力的不断进步,使用数值技术研究这些流动最近变得可行。其中,模拟自然风中观测到的湍流最有效的方法之一是大涡模拟(LES)。应用LES来分析风荷载和结构的气动弹性效应只是该领域最近的一个创举。本文综述了近几十年来细长结构周围风流分析的进展,以及最近结合自由流湍流影响的分析。首先,对产生自由流湍流的文献进行了回顾,并根据其缺陷和优势进行了评估。其中一些随后被用于分析孤立的高层模型建筑的表面压力。随后,对风洞分析和LES分析在桥梁截面气动弹性分析中的应用进行了综述。综述了湍流对气动响应影响的最新研究进展。讨论了风洞分析在风荷载分析中的应用前景及其与风洞分析的关系。
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引用次数: 4
Study on Test Setups for Determining the Failure Characterization in Masonry Components 砌体构件破坏特性测定试验装置研究
IF 1.1 Q3 Engineering Pub Date : 2022-01-21 DOI: 10.1680/jencm.21.00014
Didem Dönmez
This paper presents experimental studies and detailed micro-modeling on test setups to determine the strength and failure mechanism of brick masonry components. Experimental studies include compressive strength tests of masonry units, Red Clay brick masonry triplet tests, and Z-shaped flexural bond tests. Failure mechanism for masonry relates not only to mortar and brick material properties, but also to the bond strength between the brick and mortar. A contact law based on Cohesive Zone Model and Coulomb's law was used to describe the fracture behavior of mortar joints. Numerical studies are based on the interface cohesive model for mixed modes I and II. Tests were evaluated numerically using the Benzeggagh-Kenane mixed mode criterion. The results obtained from the FE simulation showed the reliability of computational modeling approaches for masonry bed joint behavior. Finally, a parametric study on masonry triplet tested under various compression stresses was performed by using the FE simulation. The results indicate the increase of normal compression stress leads to an increase in shear bond strength of masonry.
为了确定砖砌体构件的强度和破坏机制,本文对试验装置进行了试验研究和详细的微观建模。试验研究包括砌体单元抗压强度试验、红土砖砌体三联体试验和z形弯曲粘结试验。砌体的破坏机理不仅与砂浆和砖的材料性能有关,而且与砖和砂浆之间的粘结强度有关。采用基于黏聚区模型和库仑定律的接触律来描述砂浆缝的断裂行为。数值研究基于混合模式I和II的界面内聚模型。采用benzegagh - kenane混合模态准则对试验进行数值评价。有限元模拟结果表明,所建立的砌体床节点性能计算模型是可靠的。最后,通过有限元模拟对不同压应力下砌体三联体进行了参数化研究。结果表明,正压应力的增大导致砌体抗剪强度的增大。
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引用次数: 0
A discrete rotating links model for the nonlinear torsion-shear behaviour of masonry joints 砌体节点非线性扭剪特性的离散旋转杆模型
IF 1.1 Q3 Engineering Pub Date : 2021-10-18 DOI: 10.1680/jencm.21.00010
B. Pantò, C. Casapulla, I. Caliò
{"title":"A discrete rotating links model for the nonlinear torsion-shear behaviour of masonry joints","authors":"B. Pantò, C. Casapulla, I. Caliò","doi":"10.1680/jencm.21.00010","DOIUrl":"https://doi.org/10.1680/jencm.21.00010","url":null,"abstract":"","PeriodicalId":54061,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2021-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75328005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Behaviour of masonry walls strengthened with fibre-reinforced cementitious materials 纤维增强胶凝材料加固砌筑墙的性能
IF 1.1 Q3 Engineering Pub Date : 2021-09-30 DOI: 10.1680/jencm.21.00009
T. Celano, F. Ceroni, G. Lignola
Assessment of the mechanical properties of masonry materials is a key issue for evaluating the strength capacity of masonry walls. Two types of test are usually adopted for experimentally evaluatin...
砌体材料力学性能的评价是砌体墙体强度能力评价的关键问题。实验评价通常采用两种类型的试验。
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引用次数: 4
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Proceedings of the Institution of Civil Engineers-Engineering and Computational Mechanics
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